Full-size SIM (1FF, First Form Factor) is the original credit-card-sized SIM card format (85.6 x 54mm) used in early mobile phones before Mini-SIM became standard in the 1990s.
| Pin | Name | Function | Type |
|---|---|---|---|
| C1 | VCC | Supply voltage | PWR |
| C2 | RST | Card reset | I/O |
| C3 | CLK | Clock | BUS |
| C5 | GND | Ground | GND |
| C7 | I/O | Data input/output | BUS |
Full-size SIM (1FF, First Form Factor) is the original credit-card-sized SIM card format (85.6 x 54mm) used in early mobile phones before Mini-SIM became standard in the 1990s.